Water circulation for boilers.



Patented Nov. I2, |90I.

S. D. MTT.` WATER CIRCULATIQN- FOR BOILERS.

(Application Bled Junegl, 1901.)

2 Sheets-Sheet I.

(No Model.)

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No. 686,527. A Patented Nov. I2, |90I.

S. D. MOT'T. WATER cmcuLATl'oN F03 BolLss.

(Application led June 1, 1901.)

(No Model.) A 2 Sheets-Sheet 2.

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UNITED STATES PATENT EEICE.

SAMUEL D. MOTT, OF PASSAIC, NET JERSEY.

WATER CIRCULATION FOR BOILERS.

SPECIFICATION forming part of Letters Patent No. 686,527, dated November12, 1901.

Application filed I une 1, 1901. Serial No. 62,810. (No model.)

To all whom, it may concern:

Be it known that I, SAMUEL D. MOTT, of Passaic, Passaic county, NewJersey, have invented certain new and useful Improvements in WaterCirculation for Boilers, of which the following is a full, clear, andeXact description.

My invention relates to improvements in water circulation for boilers,and more particularly steam-boilers. y

My invention is also especially adapted for use in connection with thatclass of watertube boilers in which a header is used for containing theWater-supply and from which the water is forced into the tubes.

The objects of my invention are to produce a simple internal circulatorysystem by which the water can be'forced very rapidly into and throughthe water tubes or coils, to produce a structure of this kind which issimple and economical, to produce an apparatus which can be driven frommechanism outside the boiler, so that the desired speed of circulationcan be easily controlled, and, in general, to produce a circulationsystem which will hasten steam production, and so lessen the cost ofsteam. u

To these ends my invention consists of certain features of constructionand combinaL tions of parts, which will be hereinafter described andclaimed.

Reference is to be had to the accompanying drawings, forming part ofthis specification, in which similar figures of reference refer tosimilar parts throughout the several Views.

Figure l is avertical longitudinal section of aboiler-header providedwith myimproved circulatory device. Fig; 2 isk an end elevation of theheader andthe driving means for moving the circulatory apparatus, theView also showing` means for driving an external water-feed to supplythe boiler. Fig. 3is a plan View, partly in section, of the deviceillustrated in Figs. 1 and 2; and Fig. 4 is a detail sectional plan ofthe driving mechanism and the internal arrangement of pistons in theheader.

I have shown my invention in, connection with a header 10 of the kindillustrated in an application for Letters Patent of mine,seriallynumbered 38,701, tiled December 4, 1900; but my invention can be usedwith other types of header. As illustrated, the header or drum 10 is cutaway on the back, as shown at 11, to provide space for boiler-tubes, andit is also provided with a water-feed 12, having boiler connections 13and 14. These have nothing to do With my present invention and are shownmerely to make 'the device complete.

The type of header illustrated has tube connections lOa and 10b at topand bottom, as

. shown clearly in Fig. 3; but the arrange ment of tubes is notmaterial. It will be understood, however, that whatever the tubearrangement may be the outiow will be from the water-holding part of theheader and the return will be through the upper connection 10, thisbeing as usual in all boilers of this type. o

The header' isdivided below the water-line by a horizontal partition 27,which merges into an internal casing 28. (Best shown in Figs. 2-and 3.)This casing has openings 29 and 30 at top and bottom, so that the watermay circulate through it from the top down, as indicated by the arrowsin Fig. 3.

Within the casing 28 is a pairof pistons 31, of irregular oblongformation, the parts of which mesh, as the drawings clearly show, andthus when the two pistons are turned in unison they serve the purpose ofa rotary-piston pump and force the water from above the partition 27downward through the opening 30 and out through lthe tubes connectedwith the header. These tubes are not shown, because they form no part ofthe invention; but they return through the connections at the upper partof the header, so that the Water forced out through the tubes comesback, eithery as steam or water, into the top portion of the header, andas the pistons 31 extend entirely across the casing 28 they serveadmirably the purpose of pumping, and the forced circulation is kept up.I do not limit my invention tothe particular form of internal pumpshown, although this is well adapted for the purpose.

It is obvious that various mechanical means can be employed for turningthe pistons 3l; but, as illustrated, they are secured to shafts 32,which at one end are journaled within the header 10, as shown in Fig. 2,and extend outward through stuffing-boxes 32a, being journaled on theoutside in a bracket- IOO frame 33 on the front of the boiler. The twoshafts are geared together .by the meshing gear-wheels 34, (see Figs. land 2,) and one of the shafts 32 has a gear 35, which may be driven fromany suitable source of power, and of course any other means can besubstituted for turning the shafts.

It will be seen that the arrangement described for forcing thecirculation is well adapted for boilers employed in automobilework, asthe gear-wheel 35 or its equivalent may be turned from some running partof the vehicle, and so if the vehicle is running fast, and consequentlyusing much steam, the circulation will be rapid and steaming made easy,while, on the other hand, as the speed lessens the circulationcorrespondingly lessens.

I have shown in the accompanying drawings mechanism for working thewater-feed in the receptacle 12, because the said mechanism is used inconnection with the internal boiler circulation.

One shaft 32 has a worm 36 thereon, which engages and drives aworm-wheel 37 on the vertical shaft 38, the latter being journaled inthe bracket-frame 33, above referred to, and in a bracket 39 below it,and the shaft 38 carries a worm 40, meshing with and driving aworm-wheel 4l on the shaft 42, which is arranged below and at rightangles to the shafts 32, being journaled in the bracket 39 and thebracket 43 on the boiler-front. The shaft 42 carries a cam-wheel 44,which engages the roller 45 on the slide-block 46, the latter beingslidable vertically in the guideway 47, which is supported on thebracket 48, as shown in Fig. l. The slide-block 46 is rigid on the shaft49,which extends upward through a stuliing-box 50 into the receptacle l2and operates the valve mechanism (not shown) in the tank for regulatingthe water-feed to the boiler.

Referring to Fig. 3, it will be noticed that the essential thing is tohave the boiler or headerdivided below7 the water-line at apoint betweenthe outgoing and incoming tubes and that the pump be located in theopening through the partition, so that when started it will force thewater outward through the tube connections.

In the header 10 of the boiler I have shown a low-water alarm orindicator, which, however, has nothing to do with my present invention.This indicator comprises a float 56, a bent arm 57, secured to thefloat', a shaft 5S, extending outward through a stuffing-box in theheader-front, a crank-arm 59 on the shaft, and the usual cord 60. Irefer to these parts as they are shown in the drawings; but the headercan be used with or without them, as desired.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is

1. The combination with a divided boiler having outflow andreturnconnections for tubes on opposite sides of the division, of a pumpor water-forcing device located in the division and adapted to force thewater out through the outflow connections.

2. The combination with a divided boiler having outliow and returnconnections for tubes on opposite sides of the division, of a connectionbetween the two boiler-compartments whereby water may iiow from one partto the other, and an internal pump or waterforcing device arranged toforce the water through the outflow connections.

3. The combination with a boiler divided below the water-line, of arotary pump located in the said division and adapted to draw the waterfrom one part and force it through the other.

4. The combination with a boiler divided below the water-line and withan internal casing opening into the two divisions, of a rotary pumplocated in the said casing.

5. The combination with a boiler divided below the Water-line, of acasing forming a part of the said division but opening into the twocompartments, and rotary meshing pistons turning in the casing.

6. The combination with a boiler divided below the water-line apd withacasing forming a part ofsaid division,said casingopeninginto bothcompartments, of a rotary-piston pump contained in the casing, and meansoutside the boiler for driving the said pump.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

SAMUEL D. MOTT.

Witnesses:

WARREN B. I'IUTCHINsoN, WALTER S. ALLERTON.

IOO

